Zoom
This is a different version of the menu-item for
zooming, as described in
Section 10.5.3, “Zoom”
. Clicking with button 1 on the zoom-icon opens a panel
as in the figure below.

Figure 9.1. The Zoom slider on the Toolbar

Once the panel is open, the following actions are
possible:

Clicking with button 1 on the "knob"
followed by button 1 movement will adjust the
zoomfactor.

Clicking with button 1 on the shown percentage
allows editing the given zoomfactor (in percent)
directly with the keyboard. Double clicking on the
value shown selects the whole entry for easy
overtyping.

Clicking with button 1 below or above the knob
increases or decreass the zoom factor with 1%. Use this
function to easily fine-adjust the percentage.

Clicking with button 1 or button 2 on the
Zoom tool, or anywhere outside the
slider panel closes the panel.

The keyboard can be used to operate the Zoom
Slider as follows: When the Zoom
icon in the toolbar has the focus (indicated by the
thin blue box around it), then pressing the
spacebar opens the zoon slider panel. Use the
arrow keys to increase and decrease
the percentage 1 by 1. Use Shift-Tab
to set the focus to the percentage box, where you can
edit the given value directly. Pressing
Enter activates the changed value. When the
"knob" has the focus, pressing
PageUp/PageDown
increases/decreases the percentage by some amount. Pressing
Home sets the percentage to 300%, and
End sets it to 25%.